Hasta La Motion!

I’m new to nuke and have been trying to put together a basic composite, however I’m stuck..

I have….

1/ Background footage.

2/ Some cg to go over that background.

3/ Then a foreground with a sequence of alpha channels to use as a mask for the foreground.

How do I go about getting the alpha channels to mask out the foreground?

I can do this in PS, AE, Combustion and Fusion.. however I’m struggling here.

any help is greatly appreciated…

many thanks,
Matt

I wanted to try my hand at creating this unique effect:
http://www.flickr.com/photos/andreaskoller/2163086771/

Quote the creator: "The method is quite straight ahead:
Softbodies in Maya on a hi-res NURBS cylinder. Turbulence fields. X-Ray Shader with Sampler Info and ramp on transparency (you should find tutorials on how to build an X-Ray Shader). A Ramp on the color as well. Some Tweaking. Color correction in After-Effects with Hue/Saturation mostly and some colored layers."

Now, I decided to jump into my copy of maya and see if I couldn’t at least create the form. This is where my question starts. I can’t seem to get a visual representation of the turbulent field to display so I know if its working or not. Maybe the way I’m trying this is wrong, I don’t know. Some insight would be great in this.

Here’s my process so far:

•Create a Nurb cylinder
•Increase the subdivisions by a substantial amount
•With the cylinder selected I go to "Soft/Rigid Bodies" > "Create soft body"
•Then "Fields" > "Turbulence", and from here, I mess around with the various options for turbulence, but I’m not seeing any visual feedback of the results. Clearly i’m missing a step in my process, can anyone explain what I need to do to see the turbulence’s results?

Much appreciated.
~Bry

I’m learning the 3d aspect of Nuke.

I want to construct a set..basically a room to be built with geometry. I’ve never done this before.

I’m with Nuke, Maya and Boujou.

I’d like to do this with just Nuke and would like to know if it’s possible.

I have a 2d shot that pulled greenscreen keys from.
This shot is now a 2d layer that I will comp over a 3d background set.

I want to create this 3d room that the actor will be standing in.

I know the distance the actor was standing from the camera.
I know the height of the camera.
It was a locked shot, no camera movement.

So when I create the set out of geometry I want to be able to position the actor at a relative distance to the geometry knowing how far he was standing from the camera.

The whole room will not appear in the shot as the room will be in "reality" much bigger.

So I will want to use this room for other greenscreen shots taken from the real camera and show the room at different perspectives.

I’ve never done this before so I was wondering if this is possible from Nuke, or anything you want to say based on your own perspective.

Also if it’s better to do something like this in Nuke alone or better to build the set in Maya and then import that into Nuke?